@misc{schwalbe_efam_gtp_2002, 
author={Schwalbe, K.-H.,Heerens, J.,Zerbst, U.,Pisarski, H.,Kocak, M.},
title={EFAM GTP 02 - The GKSS Test Procedure for Determining the Fracture Behaviour of Materials},
year={2002},
howpublished = {GKSS report},
note = {Online available at: \url{} (DOI). Schwalbe, K.; Heerens, J.; Zerbst, U.; Pisarski, H.; Kocak, M.: EFAM GTP 02 - The GKSS Test Procedure for Determining the Fracture Behaviour of Materials. GKSS 2002-24. 2002.}}